Don't know what's in it and but it will build up if you don't keep it cleaned out...steaming hot soapy water and a couple dozen brush strokes keep the bore at a clean bare state.
I haven't bought the stuff at retail in 17-18 years...since the first year I learned to always buy prelubed patches at auctions or little private "garage businesses" that are having a going out of business sale or something...2000 here, 3000 there, 1000 from somebody on Craig's list, etc, etc...just bought 1000 prelubed from a guy on another forum right after Christmas for $25.00 delivered.
At those prices, its not worth the time or trouble to me to buy fabric, run it through a washing machine, then a clothes dryer, then the lubing and cutting...